35 results about "Radiofrequency field" patented technology

The invention discloses a non-screen POS machine data acquisition method and system based on NFC and a WeChat applet. A POS machine simulates an NFC Type 4 label through a non-contact chip, performs SM2 signature and encryption on equipment data containing a timestamp and a random number by using a private key instantaneously reconstructed by a PUF, and performs Base64URL-CRC packaging, segmented NDEF writing and 30s TTL setting; the mobile terminal automatically pulls up the WeChat applet after triple verification of radio frequency field stability detection, URL white list and integrity fingerprint; the small program uploads parameters through an AES-128-GCM secondary encryption and a Reed-Solomon fragment tunnel; the background adopts a Redis idempotent lock, an HSM private key decryption, an SGX enclave one-time token display mechanism and other mechanisms to complete signature verification and decryption, and it is ensured that the device data are only briefly visible in the WeChat security sandbox. According to the invention, the problems of difficult operation and maintenance data acquisition, high cost and poor security of the non-screen POS machine are solved, and cross-platform, anti-replay and man-in-the-middle-resistant high-security data acquisition can be completed within 10 seconds.

The present invention provides a multi-nuclide synchronous integrated magnetic resonance imaging nuclide quantification system and a use method therefor. The quantification system comprises n sealing containers, n ≥ 5 and being an integer. The n sealing containers are sequentially marked as container 1, container 2, container 3, …, and container n. The sealing containers are filled with a mixture containing all pre-imaging nuclides, and non-1H pre-imaging nuclides with which container 2, container 3, …, and container n are filled maintain a known concentration gradient, with the concentration gradient number being n-1. When the quantification system is used, a radio-frequency field correction coefficient distribution diagram is calculated on the basis of an image of container 1; the remaining containers are placed around an imaging part and imaged at the same time, and the radio-frequency field correction coefficient distribution diagram is used to correct the obtained images; and finally, the concentrations of different non-1H pre-imaging nuclides of a region of interest are sequentially calculated according to a fitting method. The concentration of the pre-imaging nuclide obtained in the present invention is an absolute concentration, facilitating the longitudinal observation of the change in the molecular level of the region of interest.

The invention provides a method for improving fluorine ion corrosion resistance of an aluminum piece in a deposition chamber of PECVD (Plasma Enhanced Chemical Vapor Deposition) equipment and corrosion-resistant PECVD equipment prepared by adopting the method. The method comprises the following steps: (1) introducing a first oxygen-containing gas and a first protective gas into a deposition chamber, heating a heating disc in the deposition chamber, turning on a power supply connected with a spraying plate in the deposition chamber, generating a radio frequency field in the deposition chamber, and performing first plasma vapor deposition, an aluminum oxide layer is formed on the surface of the aluminum heating disc and / or the spraying plate; and (2) turning off the power supply, introducing plasmas obtained by excitation of a second oxygen-containing gas and a second protective gas into the deposition chamber, heating a heating disc in the deposition chamber, and carrying out second plasma vapor deposition so as to form an aluminum oxide layer on the surface of the inner wall of the aluminum deposition chamber. The advantages of the PECVD equipment are utilized, disassembly and retreatment can be avoided, plasma oxidation treatment is directly carried out on the aluminum piece in the vacuum chamber, and the fluorine ion corrosion resistance of the aluminum piece is improved.

The present invention relates to the field of magnetic resonance imaging technology, and more particularly to a precisely adjustable transmitting coil vibration-damping support device, comprising a magnet, a housing fixedly connected to the interior of the magnet, a gradient coil fixedly connected to the inner wall of the housing, and a transmitting coil extending through the interior of the gradient coil. The present invention overcomes the shortcomings of the prior art by providing an X-axis adjustment hole, a Y-axis adjustment screw, and a first Z-axis adjustment hole. The X-axis adjustment screw can be moved left and right along the interior of a groove, the Y-axis adjustment screw can be turned to drive a lower damping pad and the transmitting coil to move up and down, and the Z-axis adjustment screw can be moved along the interior of the first Z-axis adjustment hole. This allows the transmitting coil to be adjusted in three directions: X, Y, and Z. This allows for precise positioning of the transmitting coil, improves the concentricity of the transmitting coil's radio frequency field, the magnet's B field, and the gradient field of the gradient coil, and thereby improves the image quality of the magnetic resonance imaging system.

The invention relates to the technical field of passive resonators, in particular to a multilayer collaborative metamaterial passive resonator for enhancing an MRI (Magnetic Resonance Imaging) radio-frequency field, which comprises a plurality of metamaterial units arranged in parallel, each metamaterial unit comprises a spiral copper wire, a flexible polyimide substrate and an external capacitor, the external capacitance value is determined through working frequencies of different magnetic resonance systems. Compared with the prior art, the structure of the multi-layer collaborative metamaterial passive resonator is designed, and the resonant frequency of the multi-layer collaborative metamaterial passive resonator is matched with the target frequency, so that the multi-layer collaborative metamaterial passive resonator realizes magnetic resonance radio frequency field enhancement in a target detection area, and the signal-to-noise ratio enhancement of a magnetic resonance image is realized.

A low-temperature dual-core synchronous magnetic resonance imaging radio frequency coil provided by the present invention comprises a radio frequency front-end circuit module and N single-channel low-temperature dual-core radio frequency coil units, each single-channel low-temperature dual-core radio frequency coil unit comprises a radio frequency coil layer, and the radio frequency coil layer is connected with a cold end face of a Peltier module through a heat conduction layer. The hot end face of the Peltier module is connected with the cooling module; the radio frequency coil layer comprises a radio frequency coil main body, the radio frequency coil main body is connected with a double-resonance tuning matching circuit, the double-resonance tuning matching circuit is connected with a transmitting-receiving change-over switch, and the transmitting-receiving change-over switch is respectively connected with a preamplifier and a radio frequency front-end circuit module; and the radio frequency front-end circuit module is loaded on the heat conduction layer of one single-channel low-temperature dual-core radio frequency coil unit. The radio frequency coil layer is in a low-temperature environment, the cost is low, the operation is easy, and electronic thermal noise is effectively inhibited; meanwhile, the single-channel low-temperature dual-core radio frequency coil unit forming the circularly polarized radio frequency field is an independent module and is convenient to repair and maintain.

The application relates to the field of semiconductor packaging and discloses a dual-mode cooperative high-aspect-ratio glass via metallization integrated process, which comprises the following steps: preparing a high-aspect-ratio via by laser modification and wet etching on a glass substrate; preparing a metal seed layer on the surface of the substrate, and hot-press bonding two pieces of substrates to form a stacked structure by using a light-decomposing bonding layer; placing the stacked structure in high-pressure carbon dioxide for pre-lubricating treatment, and then simultaneously applying a pulse direct current and a radio frequency power source for dual-mode cooperative electroplating; after surface polishing, irradiating the bonding layer with ultraviolet light to separate the substrates and perform annealing. The application changes the electric field distribution by means of double-glass stacking, replaces air with high-pressure gas to eliminate the gas-liquid interfacial tension of micropores, and breaks the ion mass transfer barrier with the help of a radio frequency field, so that the problems of bubble blockage and concentration difference polarization in the high-aspect-ratio via are solved, efficient and dense filling of metal in the deep hole is realized, and the substrates can be separated without residual glue and damage.

Systems and methods for producing synthetic radiofrequency recordings are provided. The method includes: determining a first set of waveform signal characteristics based on permutations of generated transmitters of a signal; determining a first set of rules based on permutations of possible configurations of a set of scenarios for the signal; determining a second set of rules based on environment variables for each scenario; generating individual signals based on the first set of waveform signal characteristics, the first set of rules, and the second set of rules; receiving a set of symbols that is a waveform representation of a bit string corresponding to the individual signals; creating a configuration for the individual signals; and generating and labeling based on at least one of the configurations for the individual signals or constraints to the configurations for use in training or testing machine learning models.

An apparatus for characterizing a sample using nuclear quadrupole resonance (NQR) spectroscopy is described whereby a plurality of NQR detectors operate in tandem, whereby each NQR detector is optimized to operate within a designed frequency range, having the means to shuffle the sample from one NQR detector to the next such as an automatic sample changer, having the means of controlling the frequency and amplitude of the radiofrequency field generated by the NQR detector through motors controlling variable capacitors or through the use of varactor diodes, digital capacitors, or digital potentiometers, having a plurality of Zeeman modulation coils to create a magnetic field surrounding the sample which may be arranged to minimize stray fields, such as a toroid, having the means of operating the spectrometer in frequency modulation mode, and having the capability of configuring the device for either continuous-wave NQR or pulsed NQR.

The application discloses a paper-based microfluidic intelligent wound monitoring bandage based on a laser-induced graphene electrode array and a preparation and signal processing method thereof. The bandage comprises a calcium alginate / zinc oxide antibacterial base, a wax-printed paper-based lateral chromatographic microfluidic channel layer, a CO2 laser direct writing LIG multifunctional electrode array, a colorimetric indication area, an NFC wireless communication module and a silver nanowire electrically controlled drug release module. The LIG electrode is fixed and modified by enzymes to detect uric acid, lactic acid, glucose and pH value respectively; the paper-based colorimetric disc detects bacterial protease and TNF-alpha; the NFC radio frequency field provides energy to realize battery-free operation. The built-in signal processing method comprises temperature compensation, cross interference elimination, multi-parameter fusion infection risk scoring and double-threshold closed-loop drug delivery decision. The preparation process mainly uses laser direct writing, screen printing and ion crosslinking, has low material cost and is green and environmentally friendly, and is suitable for closed-loop monitoring and treatment of chronic wounds at home and in clinic.

An apparatus for generating high energy plasma employs a low energy neutral beam injected into a magnetically contained mirror plasma to generate plasma ions that are boosted to fusion levels by a coordinated radio frequency field.

The present disclosure provides an upper electrode assembly, a semiconductor process chamber, and a semiconductor processing device, said upper electrode assembly comprising: a carrier, fixed on a chamber body of a semiconductor process chamber and provided with a receiving hole; a radio frequency isolation ring, carried on the carrier and at least partially located in the receiving hole, and used to block radio frequency energy; a gas spray head, passing through an annular cavity of the radio frequency isolation ring and carried on the radio frequency isolation ring, and capable of feeding radio frequency energy into the semiconductor process chamber; a first positioning and adjustment module, comprising: a fixing member, disposed on the carrier and located outside the radio frequency isolation ring; a pressing member, connected to the fixing member and extending toward a center of the radio frequency isolation ring, and capable of cooperating with the carrier to clamp and position the radio frequency isolation ring and the gas spray head; and an adjustment mechanism, disposed on the fixing member and capable of moving radially along the radio frequency isolation ring to enable radial movement of the gas spray head. The described upper electrode assembly can adjust the concentricity between the respective components, and can also avoid energy crosstalk within the radio frequency field, thereby improving film formation quality.

The invention discloses a passive NFC (Near Field Communication) device and a passive ink screen. The device comprises an NFC antenna, an NFC wireless communication module, a high-speed wireless communication module and an energy acquisition module, the NFC wireless communication module comprises a resonance module and an NFC controller; the NFC antenna is used for sensing an NFC radio frequency field, generating radio frequency induction voltage and realizing NFC communication and NFC energy receiving; the resonance module and an input capacitor controlled by NFC resonate at an NFC carrier working frequency; the NFC controller is used for establishing communication with the NFC reader-writer and starting the high-speed wireless communication module and the energy acquisition module after the communication is established; the high-speed wireless communication module is used for establishing wireless communication connection with the NFC reader-writer after being started to perform data exchange; and the energy acquisition module is used for acquiring and storing energy from the NFC antenna and supplying power to the high-speed wireless communication module. The passive NFC device can achieve high-speed wireless communication with an external NFC reader-writer, and the user experience effect is improved.

The invention relates to a device (2, 4) for homogenizing a radiofrequency field, for magnetic resonance imaging, of a given wavelength emitted by a volumetric antenna, comprising at least one continuous metal track (8) with a total length of between 50% and 75% of the wavelength of the radiofrequency field, the metal track comprising two end segments extending in mutually parallel directions and a main portion extending between the two end segments and comprising several local deformations identical to one another and connected to one another in series by at least one at least partially rectilinear connection portion (14) in such a way as to provide the homogenizing device (2, 4) with an electric dipole property, the homogenizing device having a fundamental frequency higher than the frequency corresponding to the wavelength of the radiofrequency field.

The present invention relates to the field of nuclear magnetic resonance technology, and discloses a nuclear magnetic resonance measurement system suitable for non-invasive quantitative detection of organs. Through the invention, a new nuclear magnetic resonance measurement system capable of achieving a regional selective excitation effect can be provided, that is, by arranging a parallel auxiliary radio frequency coil in the peripheral area of ​​the main radio frequency coil of the radio frequency subsystem, and before or during the emission of the measurement sequence pulse signal, the auxiliary radio frequency coil is used to emit a pre-saturation pulse signal to generate a radio frequency field covering a non-interested area in the detection area, so that part or all of the magnetization vectors in the non-interested area can be parallel to the static magnetic field generated by the magnet, and then during the measurement, the useless signal generated in the non-interested area and interfering with the echo signal generated in the interested area can be weakened or eliminated, achieving a regional selective excitation effect, and solving the problem of inaccurate fat detection due to the existence of an unsatisfactory excitation area in the current single-sided magnet nuclear magnetic resonance system.

The present invention provides an electrical property tomography method, system, device and medium based on instantaneous linearization, wherein the method includes: measuring a magnetic resonance radio frequency field, and calculating a transmission field based on the radio frequency field; calculating point data information of the transmission field using a numerical method; based on the transmission field and the point data information of the transmission field, according to the Maxwell equations, obtaining an initial value of the permittivity and an initial value of the conductivity at each point in space, and determining constraints K, R1 and R2 based on the initial value of the permittivity and the initial value of the conductivity; based on the transmission field, the point data information of the transmission field and the constraints K, R1 and R2, obtaining an iterative equation based on the Maxwell equations combined with the Newton iteration method; determining initial values ​​of the iterative equation based on the initial values ​​of the permittivity and the initial values ​​of the conductivity, substituting the initial values ​​into the iterative equation for iterative calculation, and obtaining the permittivity and conductivity at each point in space after several iterations; and outputting an electrical property tomography image based on the permittivity and conductivity at each point in space.

The invention discloses a real-time simulation resolving system for a complex electromagnetic environment. The system adopts a heterogeneous architecture combining radio frequency scene real-time resolving software and a hardware acceleration unit. Comprising a high-performance computing processing platform, radio frequency scene real-time resolving software and a hardware acceleration unit. The core of the system is that task division is realized through software and hardware cooperation: the calculation processing platform runs radio frequency scene real-time resolving software and is responsible for executing beat-level calculation, including analysis of a guide instruction and an external message, generation of a radiation source signal template and calculation of scene characteristic parameters; the hardware acceleration unit is specially used for pulse-level calculation, generates and modulates a multi-path radiation source pulse sequence in real time according to a signal template and scene characteristic parameters, and finally outputs a high-density staggered pulse stream through a high-speed optical fiber interface after interweaving and sorting. By means of the beat-pulse secondary calculation model, the problems that a traditional scheme is poor in real-time performance and low in fidelity are effectively solved, environment pulse density real-time calculation not lower than one million pulses per second can be supported, and the high-precision and real-time performance test verification requirements of electronic information equipment in the complex and changeable electromagnetic environment are met.

The application discloses an overlapping echo-based magnetic resonance multi-parameter simultaneous quantitative imaging method and system. The method comprises the following steps: designing an overlapping echo-based steady-state free precession multi-parameter quantitative imaging sequence; determining sampling parameters of the overlapping echo-based steady-state free precession multi-parameter quantitative imaging sequence; adding the sequence and setting the sampling parameters in an advanced magnetic resonance instrument which meets the performance requirements of the sequence and the sampling parameters, and completing data acquisition to obtain magnetic resonance data; generating training samples of a deep neural network; training the deep neural network by using the training samples to obtain a trained deep neural network; and reconstructing a magnetic resonance multi-parameter image by using the trained deep neural network and k-space data collected by the magnetic resonance imaging sequence. The method can realize simultaneous quantitative imaging of magnetic resonance multi-parameters, and can utilize different echoes and / or different k-space information in the k-space to realize correction of non-ideal factors, including but not limited to artifacts, radio frequency field inhomogeneity, main magnetic field inhomogeneity and the like.

The application discloses a multi-source micro-energy collection power distribution characteristic evaluation method and device and a storage medium, and relates to the technical field of micro-energy collection. Firstly, a multi-natural environment variable related coupling Copula function model is established according to historical wind speed, illumination, temperature and radio field intensity information of an application site, then a sampling point needing to be evaluated is established based on the probability density distribution characteristics of the natural environment, then the total power corresponding to the output of a mixed micro-energy collection system of each sampling point is calculated based on the power output characteristic curves of each micro-energy collection device, further, the multi-source mixed micro-energy collection system output power evaluation function under the sampling point is established with each natural environment variable as the dependent variable, the sampling point depth is adaptively increased by nesting until the final output power evaluation function is determined, finally, an output power sample sequence is generated, and the multi-source mixed micro-energy collection system output power probability density function is determined based on kernel density estimation.

Embodiments of the present invention disclose a method, apparatus, and magnetic resonance scanner for correcting radiofrequency field inhomogeneity in magnetic resonance imaging. The method includes: scanning a target tissue using a first pulse sequence to obtain a first MR image; acquiring a B1 + field map of the target tissue; obtaining the B1 + field map of the target tissue according to the first MR image and the B1 ‑ field map; performing B1 field inhomogeneity correction on a second MR image of the target tissue according to the B1 + field map and the B1 ‑ field map, where the second MR image is an MR image obtained by scanning the target tissue using any imaging protocol and any pulse sequence. Embodiments of the present invention optimize the B1 field inhomogeneity correction effect in MRI.

The invention provides a scattering center parameter extraction method and system based on structural analysis. A target is decomposed into a structural unit set through structural analysis, geometric feature parameters of curved surface structural units are extracted by using a convolutional neural network, and the structural units are mapped into scattering center parameters based on the geometric feature parameters, so that an equivalent scattering center point is extracted. The target is converted into a plurality of structural units through structural analysis, so that the processing complexity is greatly reduced, and the modeling efficiency of the scattering center is improved. The end-to-end mapping from the structural unit to the scattering center parameter is realized, and the physical meaning corresponding to the scattering center is clear and definite. The target radio frequency scene can be reconstructed through the scattering center point, and the method can be used for simulation verification of the detection and identification performance of a radar system.

The application aims at solving the technical problem that the time resolution of the system is difficult to break through the technical barrier of 100 femtoseconds due to the phase jitter between the radio frequency field and the pump laser in the prior art, and providing an ultrafast electron pulse non-jitter static magnetic time compression device and compression method; the device comprises a femtosecond laser, an ultrafast electron gun, an electron beam collimation transmission assembly, an Omega type static magnetic time compression assembly, an electron beam aberration correction and final stage focusing assembly and a sample cavity which are sequentially arranged on the light output path of the femtosecond laser; the Omega type static magnetic time compression assembly is used for introducing an energy related time delay to the ultrafast electron pulse, compensating the initial time chirp of the electron pulse, and compressing the pulse width of the ultrafast electron pulse to below 100 femtoseconds. In the process of electron pulse acceleration and pulse compression, the device does not need to consider the time jitter between the radio frequency field and the femtosecond laser, and can maximize the time resolution of the ultrafast characterization instrument.

The invention relates to the technical field of safety protection equipment manufacturing, and provides a full-shell helmet forming process which comprises the following steps: firstly, trimming and hole cutting are performed on a polycarbonate shell subjected to plastic uptake forming, the polycarbonate shell is respectively attached to an inner shell surface and an outer shell surface of a mold, the closed mold is preheated to a charging temperature after mold closing, and vacuumizing is performed; and the primary pre-expanded polystyrene beads and distilled water are mixed and filled into a forming cavity between the two pieces of polycarbonate through the feeding holes in the bottom or the side wall. A segmented radio frequency field is applied to the electrodes embedded in the opposite side walls of the forming cavity, so that the polystyrene particles are uniformly heated and secondarily foamed and are synchronously fused and bonded with the upper polycarbonate sheet and the lower polycarbonate sheet to form a continuous three-layer structure. And after pressure-maintaining heating is finished, the whole mold is immersed into a cold water tank to be cooled to the demolding temperature, the helmet is taken out, and the adhesive-free, light and weather-resistant helmet is obtained after the helmet is qualified. The process is uniform in foaming, short in takt time and high in weather resistance.

The invention concerns a medical device that combines the simultaneous use of high- gradient magnetic fields and radiofrequency fields for the treatment of patients. The device presents an innovative conductive electrode equipped with specific notches designed to reduce the formation of Eddy currents, which can cause unwanted heating and energy loss. Thanks to these notches, the device allows for more efficient transmission of the magnetic field without compromising radiofrequency intensity, improving both safety and therapeutic efficacy. This innovative design also increases the reliability and longevity of the device, reducing patient risks and maintenance costs.

A method for charging a fully depleted battery of a wireless charging (WLC) device is provided. An RF controller and a read-only non-volatile memory of the WLC device is powered with the RF field of a WLC charger device. The RF controller controls charging of the battery by the RF field using a first charging program stored in the read-only non-volatile memory. A microcontroller of the WLC device is booted up after the battery has reached a predetermined voltage level. The microcontroller loads a second more complex dynamic charging program into a volatile random-access memory (RAM) of the WLC device for execution by the RF controller. The RF controller transitions code execution from the first charging program in the read-only non-volatile memory to the second charging program in the RAM. In another embodiment, the WLC device is provided.

A device for treating a target lesion may include an elongate body comprising a tissue modification device on a distal end of the elongate body. The tissue modification device may include an electrode array and an expandable support structure configured to support the electrode array. When expanded, the expandable support structure is configured to space adjacent electrodes of the electrode array at a substantially equal distance. Further, when expanded, the electrode array is configured to generate one or more tissue modification energy fields around the expandable support structure when an electrical current is supplied to the electrode array. A method of treating a target lesion may include advancing a tissue modification device to a target tissue; expanding the tissue modification device to expand an electrode array; and generating a plurality of zones of radiofrequency (RF) fields through at least a part of the electrode array to ablate the target lesion.

The utility model provides a blood oxygen monitoring probe and a magnetic resonance imaging system. The blood oxygen monitoring probe comprises a blood oxygen monitoring line body; the outer shielding layer at least covers the periphery of the inner section of the blood oxygen monitoring line body; and the connecting end of the grounding wire is connected with the outer shielding layer. According to the utility model, the blood oxygen monitoring line body can extend into the shielding case so as to be respectively connected with a patient in the shielding case and a blood oxygen monitor outside the shielding case; conductive connection between the outer shielding layer and the shielding cover is achieved through the grounding wire, so that the outer shielding layer conducts two-way shielding on the blood oxygen monitoring line body, blood oxygen signals transmitted on the blood oxygen monitoring line body can be prevented from entering the shielding cover, and interference of the blood oxygen signals on magnetic resonance scanning imaging in the shielding cover is prevented; in addition, interference of radio frequency field and gradient field electromagnetism of the magnetic resonance imaging system on blood oxygen signals transmitted on the blood oxygen monitoring line body can be shielded, and compatible use of the magnetic resonance imaging system and a blood oxygen monitor can be achieved.

The invention discloses a method for regulating and controlling ion energy in a linear ion trap. The linear ion trap comprises an ion source, an inlet ion gate electrode, an outlet ion gate electrode and a radio frequency electrode, the geometric centers of the inlet ion gate electrode, the outlet ion gate electrode and the radio frequency electrode are located on the same axis and are distributed at intervals, and periodic radio frequency waves with the phase difference of 180 degrees are applied to the radio frequency electrode for ion radial constraint; and applying a direct current voltage to the inlet ion gate electrode and the outlet ion gate electrode to axially bind ions. In the short-line-shaped ion trap, direct-current voltage of an ion gate can permeate into the center of the ion trap to generate induced voltage, and the induced voltage can reduce the binding stability of a radio-frequency field to ions and promote the ions to obtain energy from the radio-frequency field. The ion energy can be regulated and controlled by changing the direct-current voltage of the ion gate.

A magnetic erection aid device which, through the action of a pulsed magnetic field or radiofrequency field, increases nitric oxide production and tissue blood flow in the applied area via endothelial nitric oxide synthase from the endothelial layer, namely the innermost layer of the vascular structure, characterized in that it comprises the following: - at least one coil generating a pulsed magnetic field effect, - at least one high-frequency circuit (3) generating a high-frequency electromagnetic field effect, - an applicator pad (4) which increases the production of nitric oxide from the endothelial layer, namely the innermost layer of the vascular structure, by endothelial nitric oxide synthase and ensures its homogeneous distribution, whereby the electromagnetic effect occurs without contact with the application area, and - a control unit (9) which makes it possible to adjust the power of the high-frequency field and the generated pulsed magnetic field effect or the operating time or frequency of the device, and makes it possible to apply the pulsed magnetic field effect or the high-frequency electromagnetic field effect in combination or separately.

Transmission cable assemblies and methods for suppressing common-mode currents on a transmission cable are provided. The transmission cable assembly may include a transmission cable and at least one trap fitted on the transmission cable. Each trap may include a first coil and a second coil in opposite helical directions and assembled to allow the transmission cable to insert through. The first coil and the second coil form a resonant circuit for reducing common-mode currents on the transmission cable. When there are multiple traps fitted on the transmission cable, they are spaced apart along the longitudinal axis of the transmission cable and an insulating component is placed between every two adjacent traps. The designs can make the trap filters smaller and lighter in weight while effectively reducing the impact on the local radiofrequency (B1) field.